The Brewers have been playing sub .500 ball since June or more than 2.5 months. Hader was fine (elite often) for half of that time, so not sure we can put anything mostly on Hader for that extended period of poor performance or even during the time he was struggling.
Is anyone going to argue with you? It's kinda like saying "I'd argue that the world isn't flat, but round", or "I'd argue that the earth circles the sun and not the other way around". Maybe its not that settled, but I think most people are thinking what the Padres did was really stupid. If they make the playoffs and have a few series wins then it might be viewed differently, but what they did is really a WS win or bust move and it's not looking good now.
Not sure why we are bashing a Nightengale tweet about trading for Trevor Rosenthal. Whether you think Nightengale is a boob (I do), what part of what he tweeted is inaccurate? That the Brewers had a bad trade deadline for 2022? That they've actually lost that many games (did he count the record wrong)? That losing % is worse than the sub-500 play for 2+ months. That the Brewers were attempting to improve their bullpen after trading the best closer in baseball? Maybe, but if the Brewers thought they had addressed their bullpen issues within the Hader trade, why trade for Bush or Rosenthal? Were the Brewers 6 games out of 1st when he tweeted?